I just dropped into my local EB Games in Australia and jokingly asked if they had any Series X consoles available...and they do

The girl behind the counter handed me the one she was holding with a cheery "There ya go!" and I almost shat a brick. After picking my jaw up off the floor and shoving my money in her face, I just brought mine home and I can call myself a happy next-gen XIMmer.
Apparently Microsoft has sorted out their preorder issues and Series X stock is filtering through to retail outlets worldwide. EB Games didn't know the stock was coming, but it was rumoured that they'd have some available for Black Friday, so supply may be limited. Get on it peeps!
Sony on the other hand way oversold PS5 preorders and stock apparently won't be available until mid-2021. Hopefully, like MS, they'll spring a pre-Xmas surprise, but I'm not holding my breath.